Icons don't appear

[cHenrique0]

I'm trying to install the theme on Mint 20.3 Una.

1. I couldn't find the /usr/lib64/arduino/lib/ folder. I found it in /usr/share/arduino/lib/.
2. I paste the arduino-master/theme in the folder above, but only colors change, the icons don't appear. (See image below).

How can i make this work?